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Question

Hi anyone

Please help with the following questions:

A seamstress had some white and some black buttons. 60% of the buttons were white. He bought another 120 buttons. Now, the percentage of white buttons became only 40% of the total. How many white buttons did he have at first?

Thanks a lot… ❓

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Source: Ai Tong

Answer

I think this is question is incomplete. There can be many solutions as it is.

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Hi, dd working.

W:B
3:2 (Before)
Plus 120
4:6 (After)

4-3=1
6-2=4
1+4=5
120/5=24
24*3= 72

There are 72 white marbles at first.

Thank you.

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72 buttons; not 72 marbles.

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